PRESSURE CONTROL VALVE AND VARIABLE DISPLACEMENT COMPRESSOR USING THE SAME

PROBLEM TO BE SOLVED: To provide a pressure control valve capable of autonomously controlling a pressure (discharge capacity) of a control chamber by promptly following a fluctuation of high pressure, and a variable displacement compressor using the same.SOLUTION: A pressure control valve 2 for regulating a pressure of a control chamber by regulating a supply amount of a working fluid from a discharge chamber to the control chamber by regulating an opening of an air supply passage connecting the discharge chamber and the control chamber, is constituted to regulate the opening of the air supply passage on the basis of only a pressure Pd of the discharge chamber among the pressure Pd of the discharge chamber, a pressure of a suction chamber and a pressure Pc of the control chamber. The pressure control valve includes a high pressure introduction space 75 communicated with the discharge chamber, a pressure regulation space 77 communicated with the control chamber, a valve port 80 communicating the high pressure introduction space 75 to the pressure regulation space 77, and a valve element 61 capable of opening and closing the valve port 80. The discharge chamber pressure Pd introduced to the high pressure introduction space 75 is made act on one end side in an operation direction of the valve element 61 in the direction to open the valve port 80, and an atmospheric air or a vacuum pressure Po is made act on the other end side in the operation direction of the valve element 61. 【課題】高圧圧力の変動に速やかに追従して制御室の圧力（吐出容量）を自律的に制御することが可能な圧力制御弁とこれを用いた可変容量圧縮機を提供する。【解決手段】吐出室と制御室とを接続する給気通路の開度を調節することにより吐出室から制御室への作動流体の供給量を調節して制御室の圧力を調整する圧力制御弁２を、吐出室の圧力Ｐｄ、吸入室の圧力、制御室の圧力Ｐｃのうち、吐出室の圧力Ｐｄのみに基づいて、給気通路の開度を調節できる構成とする。吐出室に連通する高圧導入空間７５と、制御室に連通する圧力調整空間７７と、高圧導入空間７５と圧力調整空間７７とを連通する弁口８０と、この弁口８０を開閉可能な弁体６１とを備え、弁体６１の動作方向の一端側に高圧導入空間７５に導入された吐出室圧Ｐｄを弁口８０を開放させる方向に作用させ、弁体６１の動作方向の他端側に大気圧または真空圧Ｐｏを作用させる。【選択図】図３